valueOf() vs parseXXX()

[Chaitanya Jadhav]

According to K & B
The difference between the two methods is

* parseXxx() returns the named primitive.
* valueOf() returns a newly created wrapped object of the type that invoked
the method.

But both method return primitive as well as Object.??
then what is difference between them?

 
Integer i1=Integer.valueOf("22");
  int i2=Integer.valueOf("22");
 
  double d1 = Double.parseDouble("3.14");
  Double d2 = Double.parseDouble("3.14");
   

[Ankit Garg]

Chaitanya the book is right. valueOf returns a wrapper class object. This code

int i2=Integer.valueOf("22");

works only because of autoboxing. valueOf here returns an Integer object which is unboxed to int. To test this, try this code

class ValueOfTest {

    void method(Integer i) {
        System.out.println("Integer");
    }

    void method(int i) {
        System.out.println("int");
    }
    public static void main(String[] args) {
        new ValueOfTest().method(Integer.valueOf("22"));   //displays Integer
    }

}

Same is the case with parseInt here

Double d2 = Double.parseDouble("3.14");  //works because of autoboxing

[Chaitanya Jadhav]

Ankit...

nice example .
thanks..
now i understood..